A company introduces a new product for which the number of units sold \( S \) is given by the equation below, where \( t \) is the time in months. \(S ( t ) = 110 ( 7 - \frac { 9 } { 2 + t } )\)
(a) Find the average rate of change of \( S ( t ) \) during the first year.
(b) During what month of the first year does \( S ^ { \prime } ( t ) \) equal the average rate of change?